对硬质聚氨酯泡沫塑料发泡时泡沫中心部位温度的分析计算

本文计算了硬质聚氨酯泡沫塑料组合聚醚主要组分的配比、硬泡容重、搅拌时间与发泡反应时泡沫体中心部位的关系，分析了发泡地泡沫体中心部位温度以遥影响。     

影响方舱大板质量的几个环节

本文论述了方舱大板生产过程中硬质聚氨酯泡沫塑料的发泡原理、泡沫的稳定，发泡后熟化温度和熟化时间的选择；指出发泡时要有最佳的模具温度和均匀的模板温度场；介绍了料温和环境温度影响发泡的情况以及提出了选择上乘发泡原材料的原则。     

浇注发泡成型的硬质聚氨酯泡沫塑料

本文科普性地介绍了浇注型的硬质聚氨酯泡沫塑料的基本反应、原料及各组份的作用，同时对工艺因素作了解释。最后举例给出了一个典型的浇注发泡成型的配方，并对浇注发泡成型泡沫常见缺陷及纠正方法作了经验性的总法。     

硬质泡沫喷管堵盖试验及研究

介绍了固体火箭发动机喷管硬质泡沫塑料堵盖的设计方法与试验过程。某型号发动机硬质泡沫喷管堵盖打开压强模拟点火试验结果表明,这种硬质泡沫喷管堵盖设计方案可行。并已在实际中得到应用。     

一氟三氯甲烷替代品的技术进展

本文介绍了硬质聚氨酯泡沫塑料发泡剂替品的技术要求和替代工作的技术进展。     

聚氨酯推进剂化学交联网络模型及c的计算

所谓复杂化学文联型聚氨酯网络是指固化体系中含有官能度大于4的预聚物及固化剂固化形成的交联网络。本文研究分析了复杂化学文联型聚氨酯（PU）网络形成过程和网络结构的特点，建立了复杂网络结构的简化模型，提出了计算其的理论公式。这些公式在PU弹性体及PU推进剂结构与性能之间关系的研究和PU泡沫、弹性体、PU固体推进剂等制品的质量控制中，将有广泛的应用。     

聚氨酯硬质泡沫塑料的基本性能

本文介绍了硬质聚氨酯泡沫塑料室温存放后，质量损失的试验，分析了发泡剂在泡沫塑料内部随着环境温度的变化而发生溶解、渗透、扩散的运动过程。     

聚氨酯硬泡沫塑料的低温线胀

分析了泡沫线胀对低温绝热效果的影响,研究测定了聚氨酯硬泡沫塑料的低温线胀随温度,密度、方向以及冷热循环次数的变化规律并作了机理探讨。在大量实验的基础上给出了聚氨酯硬泡沫塑料低温线胀的变化范围和平均值。     

聚氨酯推进剂化学交联网络模型及M↑c的计算

所谓复杂化学交联型聚氨酯网络是指固化体系中含有官能度大于４的预聚物及固化剂固化形成的交联网络。本文研究分析了复杂化学交联型聚氨酯（ＰＵ）网络形成过程和网络结构的特点，建立了复杂网络结构的简化模型，提出了计算其Ｍ↑－ｃ的理论公式。这些公式在ＰＵ弹性体及ＰＵ推进剂结构与性能之间关系的研究和ＰＵ泡沫、弹性体、ＰＵ固体推进剂等制品的质量控制中，将有广泛的应用。     

玻璃钢-聚氨酯泡沫夹层板弯曲失效研究

采用真空灌注方法研制了玻璃纤维-聚氨酯泡沫夹层板,通过理论推导、数值仿真及试验验证对该夹层板的弯曲失效特性进行了研究,得到了实际失效载荷以及两种失效模式。研究表明,玻璃纤维-聚氨酯泡沫夹层板的载荷变形曲线中会出现2处拐点：第一拐点对应第一失效模式,其表征为表层玻璃纤维被拉伸断裂;第二拐点对应第二失效模式,其表征为芯体泡沫被剪切开裂。     

俄罗斯宇航工程中常用的胶粘剂

俄罗斯宇航工程中应用大量高性能胶粘剂 ,主要有环氧胶粘剂、聚氨酯胶粘剂、有机硅胶粘剂、合成橡胶胶粘剂、酚醛胶粘剂及厌氧类胶粘剂等。这些胶粘剂的应用 ,使各种宇航结构件的复合胶接成型、电子元器件的固封、各种保温隔热材料的粘接成为可能 ,并使其具有优异性能     

系统总线接口适配器研制中1553B总线的解决方案

15 5 3B总线是一种集中式控制的串行总线型网络 ,文中详细介绍系统总线接口适配器研制中 15 5 3B总线的软件与硬件设计方案。     

复合材料格栅适配器优化设计

首先,对运载火箭复合材料截锥形格栅适配器的质量目标函数与其几何构型及尺寸间的关系进行了研究。在此基础上,给出了舱壁厚度、斜向肋与环向肋宽度、斜向肋与环向肋数量及斜向肋倾斜角度等6个基本设计变量。在斜向肋数量给定的前提下,通过探寻无环向肋适配器优化质量随斜向肋倾斜角度的变化规律,并进一步将该变化规律与斜向肋间的交叉点数相结合,总结出一种简捷、有效的格栅适配器的优化设计方法。在同现有的某型号运载火箭复合材料薄壁结构适配器的对比中发现,在相同设计要求下,复合材料格栅适配器质量降低约30%,证实了该结构的高效及实用。     

上面级结构模态试验与分析技术

文章介绍了MOTOROLA模拟星+上面级适配器的模态试验技术与分析计算技术,给出了如何用试验与分析相结合的方法来解决复杂结构的动特性问题,其中包括识别复杂空间密集模态的试验技术,广义结构的模态计算技术、以及试验与计算相结合的技术.     

空间环境对聚氨酯涂覆织物力学性能影响试验研究

试验研究了模拟空间环境对聚氨酯涂覆织物力学性能的影响。结果表明:单面涂覆聚氨酯芳纶复合材料力学性能在高温、低温下降低;湿热、高低温交变和复合环境对其力学性能影响不明显。双面涂覆聚氨酯尼龙纤维力学性能在低温下明显增强,在高温、湿热环境下降低;高低温交变和复合环境对其力学性能影响不明显。     

Command shaping for a flexible satellite platform controlled by advanced fly-wheels systems

In this paper we consider the coupling between the flexibility of a spacecraft equipped with variable speed control moment Gyros and its attitude control system, in the framework of command shaping techniques. The analysis is performed on the set of equation of motion written in an explicit form describing a flexible platform and N wheels gimballed to it. The attitude control system is designed upon a Lyapunov based feedback relying upon a rigid body model. Whenever the structure is not stiff enough, flexibility degrades the performances of the controller that fails to track the desired history. We therefore study the possibility of altering the tracking signal fed to the controller trying to get rid of the relevant frequencies notch filtering them in order to reduce vibrations. The results obtained for a test case attitude acquisition maneuver are presented and the benefit deriving from the command shaping technique evaluated and discussed.     

Shock waves in water foams

Propagation of shock waves in tubes filled with water foams is studied using pressure gauges. Low amplitude shock waves consist of a precursor which propagates at a velocity slightly less than the acoustic velocity in the gas, and of a main compression wave which propagates slower than the precursor. Stronger shock waves have a single front. Maximum pressure rise in the incident and reflected shock waves cannot be calculated using one-dimensional conservation equations at the shock front. It is suggested that the flow of the liquid in foam cells has to be taken into account in order to predict the behavior of shock waves in foams. The nature of the gas which fills the cells is shown to have a strong effect on the quenching of blast waves in foams.     

Mission STS-134: Results of Shape Memory Foam Experiment

Shape memory epoxy foams were used for an experiment aboard the International Space Station (ISS) to evaluate the feasibility of their use for building light actuators and expandable/deployable structures. The experiment named I-FOAM was performed by an autonomous device contained in the BIOKON container (by Kayser Italia) which was in turn composed of control and heating system, battery pack and data acquisition system. To simulate the actuation of simple devices in micro-gravity conditions, three different configurations (compression, bending and torsion) were chosen during the memory step of the foams so as to produce their recovery on ISS. Micro-gravity does not affect the ability of the foams to recover their shape but it poses limits for the heating system design because of the difference in heat transfer on Earth and in orbit. A recovery about 70% was measured at a temperature of 110 °C for the bending and torsion configuration whereas poor recovery was observed for the compression case. Thanks to these results, a new experiment has been developed for a future mission by the same device: for the first time a shape memory composite will be recovered, and the actuation load during time will be measured during the recovery of an epoxy foam sample.     

一类刚-柔耦合系统的模态特性与实验研究

本文从理论和实验两方面研究了由中心刚体和柔性梁组成的刚柔耦合系统的模态特性。结果表明该系统的模态与静止情况正气结构动力学模态存在较大差异，系统的模态频率与刚体Hub和柔性梁的转动惯量比值有一定关系，这为研究这类刚柔耦合系统的动力学与控制问题提供了一些有益的参考。     

环氧化端羟基聚丁二烯／H12 MDI型聚氨酯固化工艺的研究

采用环氧化端羟基聚丁二烯(EHTPB)与H12MDI固化交联形成聚氨酯弹性体,利用DSC外推法研究了EHTPB/H12MDI型聚氨酯固化的最佳反应温度,再通过测量固化产物的力学性能研究了其他最佳固化工艺参数,包括反应时间、固化剂H12MDI用量、EHTPB环氧值以及扩链剂BDO用量,并在相同条件下对端羟基聚丁二烯(HTPB)/H12MDI和EHTPB/H12MDI固化产物的力学性能进行了比较。结果表明,EHTPB/H12MDI固化产物具备更好的力学性能,并得到了EHTPB/H12MDI型聚氨酯弹性体的最佳固化工艺条件。